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Re: Check engine Light is on for a while, then goes off
Hi the engine check light is telling u that a sensor on your engine or tranmisson is faulty it needs to have the fault codes checked by a mechanic.
try disconnecting u battery lead for 60 sec BUT MAKE SURE U HAVE RADIO CODE OR U WILL LOOSE USE OF RADIO try it for a couple of days and if it comes back see a dealer
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I suggest scanned the computer in order to know fault codes stored there, soud like a EVAp or Emissions failing.
If the Check Engine Light comes on in the city but goes off on the freeway, then the fault is present during city driving conditions. Pay attention to whether or not the vehicle runs or drives any differently when the Check Engine Light illuminates. If vehicle performance does change, drive the car as little as possible and take it to be checked by a service professional as soon as possible. If there is no change in vehicle performance, you can drive home, but have it inspected as soon as possible. In this condition, you run a risk of the vehicle dying or not starting.
* The Check Engine Light comes on and stays on. If the Check Engine Light illuminates constantly during driving with no noticeable driving or performance problems, there is a permanent fault in the emission control system. When this happens, the computer that controls the emission system usually has a backup program that runs while the fault is present. (These backup programs are often referred to as "limp home" mode programs.) You should get the vehicle serviced as soon as possible, but in most cases, the vehicle will continue to operate, though you run a risk of it dying or not starting.
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have you had the catalytic converter checked. When they break apart they will make a rattle ling noise. eventually the broken pieces will plug the exhaust and cause a lack of power feeling. When the exhaust is cold hit the bottom of the catalytic converter with your hand. If it rattles it is bad and needs to be replaced.
Until yesterday, I have never had a serious mechanical issues with my 2006 Envoy Denali, which only has +/-60K Miles (under extended 100K Mile warranty).
Yesterday, however, while taking an interstate on-ramp (I think I hit 40 MPH tops?), my 5.3L V-8 engine shut down while in use. I immediately pulled over, as my power steering went out when the vehicle shut off, and coasted to a stop on the shoulder.
My vehicle would not restart... the dealership took a look at it this morning, and their preliminary findings are that the engine threw a rod, there's metal shavings, and some liquid (water?) in the engine.
I'm still awaiting their full estimate of the damage.
Go check your oil first. If it is low or absent then you need to go get some! The car needs 2-3 quarts to get back into range at the least. Then try starting the engine. If the car starts and the light goes out you can drive to a mechanic and have the check engine code read to see what else is wrong. If the oil light stays on....call for a tow truck! You risk serious and complete engine damage if you drive any further...if you havent already!
try changing your pcv valve. if its dirty it may be causing the shuttering. as for the check engine light going on and off, you may have a bad gas cap. if the cap is faulty it will cause the engine light to come on at times because of a poor air to fuel ratio.
does the check engine light stay on for an extended period of time after it first appears? if so you could drive the truck to any auto zone and they should have a diagnostic computer there they can plug into your truck and if you can read the code the computer threw you will be able to narrow down the issue you are having. whether its O2 sensor, misfire... you get the idea. Good luck!
Hi, this will happen when the oil sending unit(module) is malfunctioning. This a sensor that reads the information and sends the alerts which initiates the lights actions. Replacing this sending unit(module) will fix this issue. There is a more sever issue that may not be the case but, there is a chance. The oil pump itself may be malfunctioning. this could also trigger this alert as well. I suspect the sending unit may be malfunctioning.
Just found your posting of the problem, 1st thing to do is see why the check engine light came on. You can stop at a parts store, most will check for codes for free. They plug a hand held scan tool into the computer port under the dash, and 'scan' for any trouble codes stored in the trucks computer. Write down the codes, and have them explain what they mean, and what they recommend to fix the problem. U can post any questions here, include the codes. U need to get this checked out before u attempt the long trip home, as this could result in a breakdown, or possible further damage to the vehicle if u continue to drive it.